/**
* check_captcha()
*
* @param string $captcha
* @param boolean $timer (on|off)(true|false)
* @return boolean
*/
function check_captcha($captcha, $timer = true)
{
global $error_captcha;
$captcha = htmlspecialchars(stripslashes(trim($captcha)));
if (empty($captcha)) {
$error_captcha = ERROR_MESSAGE_CAPTCHA;
remove_cookie();
return false;
} elseif (isset($_COOKIE['Captcha'])) {
list($Hash, $Time) = explode('.', $_COOKIE['Captcha']);
if (md5(SALTING . $captcha . $_SERVER['REMOTE_ADDR'] . $Time) != $Hash) {
$error_captcha = ERROR_MESSAGE_CAPTCHA_INVALID;
remove_cookie();
return false;
} elseif (time() - COOKIE_TIMER * 60 > $Time && $timer) {
$error_captcha = ERROR_MESSAGE_CAPTCHA_TIMED_OUT;
remove_cookie();
return false;
}
} else {
$error_captcha = ERROR_MESSAGE_CAPTCHA_COOKIE;
return false;
}
return true;
}
static function logout()
{
remove_cookie('user');
}
/**
* Destroys the session, removing all data stored in this session and
* removing any reference to this session.
*/
public function session_destroy()
{
# Remove cookie
remove_cookie($this->sign($this->session->id, $this->session->salt));
# Remove session from database
$this->session->delete();
}